A research study was conducted to investigate the culture possibility of fresh water catfish Pangasius pangasius with formulated feed in natural ponds. The stocking density was chosen as 8000 fry/ha with an initial weight of 42.57+ 2.51 g. The formulated feed contained 45 % fishmeal, 30 % mustard

of two salamanders, Ambystoma maculatum (the yellow-spotted salamander) and Ambystoma laterale (the blue-spotted salamander), were exposed to different UV-B radiation regimes in containers (12 cm in diameter and 4.5 cm deep) with Nitex screening (1 mm) on the sides to permit natural exchange with pond

in control fish in an unaffected pond. In addition to insoluble aluminium and iron, gills showed presence of iron bacteria. Histopathology was characterised by expression of reactive processes and regressive alterations resulting in gill tissue necrosis. Impairment of the excretory function of gills

relative importance of natural and anthropogenic

for taking the time to teach me the local field sites and natural history of pond biota. Gary Mittelbach generously shared his knowledge of ponds and lakes of central Michigan and allowed me to use his laboratory space. Several people kindly helped set up, monitor, and sample my field experiments in Michigan,

Within BNL’s 5,265-acre site there are 26 wetlands. Included are coastal plain ponds, vernal ponds, recharge basins, and streams, making it an ideal ecological site to study water chemistry. We tested water samples from seven coastal plain ponds on BNL: four natural (BP1, BP2, BP6, BP9), one man

The benthos are most important or-ganisms of natural water bodies which are directly or indirectly used as food and energy for fishes and other organisms. Various physico-chemical properties of bottom soil have combined effect on the growth of ben-thos. Variations in production of benthos

ABSTRACT-Energy generation is increasing day by day due to rapid industrialization. Energy generation through thermal power plants is very typical now days. Pond ash (PA) from these thermal plants is available in large quantities. Pond ash utilization helps to reduce the consumption of natural

toward the outlet. This pond shape fits well into natural swales or draws.

The most common substances used in pond aquaculture are fertilizers and liming materi-als. Fertilizers are highly soluble and release nutrients that can cause eutrophication of natural waters. Fertilizers are also corrosive and some are highly explosive, so proper handling is necessary to prevent